From: "Kaz Kylheku (Cygwin)" <743-406-3965@kylheku.com>
To: moss@cs.umass.edu
Cc: Jay K <jayk123@hotmail.com>, cygwin@sourceware.org
Subject: Re: ExitProcess does not work in Cygwin?
Date: Thu, 13 Jan 2022 09:07:50 -0800 [thread overview]
Message-ID: <72e0f0601676717a2702ff13beb45b80@mail.kylheku.com> (raw)
In-Reply-To: <1f98eb84-e3d7-bf0d-875c-3d4818e41aef@cs.umass.edu>
On 2022-01-13 05:40, Eliot Moss wrote:
> On 1/13/2022 1:39 AM, Jay K wrote:
>> ExitProcess does not work in Cygwin?
>
> ExitProcess does not appear to be a POSIX function.
This is a real issue worth looking into. Though ExitProcess isn't a
POSIX
function, Cygwin can capture the termination status of non-Cygwin
programs.
The concept of termination status cannot be entirely walled off in a
private Cygwin garden; it belongs to the underlying platform.
In Cygwin, I can do this:
C:\Cygwin\cygwin64\home\kaz>exit 1
1:BLACKBOX:~$
1:BLACKBOX:~$ echo $?
1
0:BLACKBOX:~$ cmd
Microsoft Windows [Version 10.0.19042.1052]
(c) Microsoft Corporation. All rights reserved.
C:\Cygwin\cygwin64\home\kaz>exit 0
0:BLACKBOX:~$
The number in my Bash prompt is the last exit code. As you can see,
the non-Cygwin CMD.EXE program produces a termination code which
is recognized in the Cygwin world.
Most likely it does that via ExitProcess.
It is odd if calling ExitProcess in a Cygwin process causes
a Cygwin parent not to similarly process the status, as seems
to be shown by Jay's test cases.
Cygwin supports non-POSIX programming; you can write GUI applications
using Win32 calls for instance.
(Now I agree that for exiting your process, even if it's a GUI
application using numerous win32 calls, you should probably do it the
Cygwin way, and use exit, or return from main. But still ...)
next prev parent reply other threads:[~2022-01-13 17:07 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-13 6:39 Jay K
2022-01-13 13:40 ` Eliot Moss
2022-01-13 17:07 ` Kaz Kylheku (Cygwin) [this message]
2022-01-13 17:19 ` Brian Inglis
2022-01-13 23:15 ` Jay K
2022-01-14 6:19 ` Brian Inglis
2022-01-26 14:23 ` Andrey Repin
2022-01-26 17:06 ` Jay K
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